The heart of the build is a NEO-6M GPS module which features a dedicated pulse per second (PPS) pin. The ESP8266 combines the timestamp from the GPS messages and the PPS signal to synchronize ...

This pin is on the rear of the ESP8266 module, and on many development boards, it isn’t even connected. That’s because its internally hooked up to the ESP8266’s SPI flash chip, and using it ...

It consists of ESP8266-12E, USB C Port USB port for charging and communication, CP2102, Battery Connector, On/Off switch, Flash, PMSA003 sensor selection jumper, BME280 and many more.” ...